Draft regulator



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W. F. MOR-TIMER DRAFT REGULATOR Jian. i6, 11934.

Filed March `16, 1931 j 17' Je z /N VEN "VO/e W/ TA/ESSES Y TTORNEY Patented Jan. 16, 1934 DRAFT REGULATOR Winfield l". Mortimer, Milwaukee, Wis., assigner to Emco Manufacturing Company, Milwaukee9 Wis., a corporation of Wisconsin Application March 16, 1931.. Serial No. 522,847

Claims.

This invention has for its object to provide a combined damper and check draft with a draft -regulator feature sensitive to the variations in the degree of suction present in the smoke-pipe to open or close to a greater extent a regulator valve adjustably biased to vary the degree of check proportionately.

An object of the invention is to utilize the check draft opening for the automatic draft regulation and obviate the necessity for a separate nxture.

Another object o the invention is to simplify the construction and reduce the cost of manufacture.

With the above and other objects in view the invention consists in the draft regulator as herein claimed and all equivalents.

Referring to the accompanying drawing, in which like characters of reference indicate the same parts in diierent lviews,

Fig. l is a longitudinal sectional view of a smoke-pipe equipped with a draft regulator in accordance with this invention;

Fig. 2 is a plan view thereof;

Fig. 3 is a sectional View on the plane of line .3--3 of Fig. 1 avoiding the flap. and

Fig. 4 is a sectional view through the pivotal connections of the damper and the draft regulating ap on the plane of line l-Ji of Fig. l, but with the parts in dierent positions.

In this drawing, l0 indicates a smoke-pipe such as the smoke-pipe of a domestic heating plant, and 11 is the frame or box housing mounted thereon and surrounding the check draft opening cut in the pipe as usual and having a ledge 12 forming the seat for the damper member 13. The damper is pivotally mounted in the frame as by trunnions 14 and a larger cylindrical portion 15 thereof, concentric with the trunnions, closely fits against the end wall of the frame in all positions of the damper, A counterbalanced weight 16 on one of the trunnions of the damper serves as a means for facilitating its movements and for adjusting its position, either by means of connected chains as usual or otherwise. Threaded through a projecting lug on the frame is a set-screw 17 passing through an opening in the smoke-pipe into the range of movement of a stop lug`18 of the damper, thereby constituting an adjustable stop for limiting the closing of the damper.

Plvotally mounted on a pin 25 within a recess 19 of the cylindrical portion 15 of the damper and preferably coaxial with the damper is alight sheet metal draft regulator nap 20, the inner end thereof, in its various positions with respect to the damper, tting closely the cylindrical wall of the recess 19. This light nap 20, preferably of sheet aluminum, is counterbalanced and biased adjustably by havingv a wire stem 21 secured 6@ thereto and arched to avoid the frame and to bring its straight threaded end portion beyond the pivot of the ap. A weight 22 is threaded on the straight portion of the Wire 21 and is held by lock nuts in its adjustments, where it will give the desired closing bias to the flap, the direction of the wire 21 being oblique to the axis of the smoke-pipe, as seen in Fig. 2, to give the weight the necessary range of movement to permit the ap to close into the opening of the seat l2 for the damper. The flap is stopped in its closed Y position by striking a stop lug 23 projecting from flange 12, which stop lug is faced with a cushion 24 of felt or the like to silence the operation.

In operation the damper may be set in any position, either manually by automatic control mechanism, between the full closed position determined by the adjustment of stop screw 17 and the full open position against the seat formed by ledge l2 in order that the heater may be sub- -jected to the full draft, or any partial draft of which the chimney is capable. As the damper is closed it moves away from its seat andA consequently opens the check in a manner well known in this art, thus accomplishing the same end in two ways. However, the modification of the effective check draft by the biased flap 20 according to the degree oi draft due to chimney conditions produces a draft regulation protecting the heating plant fromexcessive draft under all conditions. The adjustment of weight 22 may be made to allow the flap 20 to stand open to the 'desired degree for a given position of the damper under normal draft, whereupon an increase of the draft would merely cause said flap to open wider and so protect the heating plant from such increase, whereas a reduction in the draft will permit the flap to close more and thereby reduce the amount of check draft and consequently increase the proportionate amount of draft imposed upon the heating plant so thatv the latter remains normaland unaffected by the change.

This regulator enables the draft on the heating plant to be set at a predetermined amount for e. given position of the damper and assures against fluctuation thereof incident to sudden changes in the draft of the chimney as during a wind storm when draft conditions of the chimney vary greatly. In different positions of the damper the flap will assume different positions because in changing the damper to vary the proportions of the draft between the'heating plant and. the check draft the influence on the ap becomes more or less. Under a uniform draft the opening of the damper toward its seat causes a corresponding closing of the flap toward its stop and the more the damper is closed the more the Y fiap is opened. However, in any position of the damper, the ilap serves to vary the degree of check draft according tothe changing conditions of the chimney draft, thus tending to keep uniform the draft imposed on the heating plant.

What I claim as new and desire to secure by Letters Patent is: s'

l. A draft regulator, comprising a smoke pipe having a check draft opening, a combined checkdraft and damper device in which there is a movable damper member adapted in its various positions to obstruct more or less the passageway through the smoke-pipe and close more or less thel check-draft opening, in combination with a regulator flap mounted on the damper to have relative movement and biased to a position for closing the check-draft opening but sensitive to the draft in the smoke-pipe for opening the check-draft more or less by such relative movement.

2. In a draft regulator, a smoke-pipe having a check draft opening and a combined checkdraft and damper device comprising a frame with a check-draft opening and a movable damper for closing the check-draft opening in one position and for obstructing the passageway through the smoke-pipe in another position, in combination with a regulator lap pivotally mounted on the damper to have relative movement and adjustably counterweighted and closing the check-draft opening more or less by such relative movement according to the condition of draft in the smokeipe.

3. A draft regulator comprising a smoke pipe having an opening, a frame adapted to be secured to the opening of the smoke-pipe and providing a check-draft opening with a seat therearound, a damper pivotally mounted in the frame and tting against the seat to close the cheek-draft opening in one position and adapted to obstruct the passageway through the smokepipe in another position, a regulator flap pivotally mounted on the damper to swing independently and automatically, and an adjustable counterweight connected with the regulator flap for biasing it to a position for closing the check-draft opening.

4. A draft regulator comprising a smoke pipe having an opening, a frame secured to the smokepipe around the opening thereof and to afford a check-draft opening, a ledge forming a damper seat around the check-draft opening, a damper pivotally mounted in the frame and fitting against the damper seat in one position and obstructing the passageway through the smoke-pipe in another position, said damper having an axial recess, a regulator flap pivotally mounted in said axial recess and fitting with the walls of said recess in the different positions thereof and closing the check-draft opening in one position thereof, and an adjustable counterweight mountedon the regulator flap n for bias-ing it toward such position.

5. A draft regulator comprising in combination with a smoke pipe having a check draft opening, a frame secured to the smoke-pipe around the opening thereof, a ledge within the frame forming a damper seat around the check-draft opening, a damper pivotally mounted in the frame and having a cylindrical axial enlargement for fitting the end of the check-draft opening in all positions thereof, said damper fitting against the damper seat in one position and obstructing the passageway through the smoke-pipe in another position, a set screw on the frame, a stop lug on the damper for engaging therewith to limit the movements o the damper, said cylindrical axial enlargement of the damper having a recess, a regulator iiap pivotally mounted in said recess and fitting within the check-draft opening, a stop Alug on the ledge of the frame for limiting the movement of the regulator flap, a stem secured to the regulator flap and bent over the damper mounting and extending obliquely with respect to the smoke-pipe, and a counterweight adjustably threaded on the stem for biasing the regulator flap to its position Within the check-draft opening.

WINFEELD F. MORTIMER. 

